US8637172B2 - Secondary battery - Google Patents

Secondary battery Download PDF

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Publication number
US8637172B2
US8637172B2 US11/979,070 US97907007A US8637172B2 US 8637172 B2 US8637172 B2 US 8637172B2 US 97907007 A US97907007 A US 97907007A US 8637172 B2 US8637172 B2 US 8637172B2
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Prior art keywords
bare cell
connection
support member
secondary battery
molding body
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Expired - Fee Related, expires
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US11/979,070
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US20080102357A1 (en
Inventor
Jintae Hong
Inkyu Park
Woonseong Baek
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Samsung SDI Co Ltd
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Samsung SDI Co Ltd
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Assigned to SAMSUNG SDI CO., LTD., A CORPORATION CHARTERED IN AND EXSISTING UNDER THE LAWS OF THE REPUBLIC OF KOREA reassignment SAMSUNG SDI CO., LTD., A CORPORATION CHARTERED IN AND EXSISTING UNDER THE LAWS OF THE REPUBLIC OF KOREA ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BAEK, WOONSEONG, HONG, JINTAE, PARK, INKYU
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0436—Small-sized flat cells or batteries for portable equipment
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/02—Details
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/147—Lids or covers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/147—Lids or covers
    • H01M50/148—Lids or covers characterised by their shape
    • H01M50/15—Lids or covers characterised by their shape for prismatic or rectangular cells
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • the present invention relates to a secondary battery, and in particular relating to a secondary battery in which connection between the bare cell and the protection circuit can be established by a mechanical connection system without using molding method.
  • the battery pack includes at least one battery for outputting a voltage at a constant level for driving the portable electrical and electronic devices for a predetermined period.
  • the battery pack can employ a secondary battery in which both of charging and discharging are available.
  • Lithium secondary battery such as nickel-cadmium battery (Ni—Cd), nickel-hydrogen battery (Ni-MH), lithium (Li) battery and lithium ion battery and etc. can be typically used for the secondary battery.
  • the battery as an energy source, is capable of storing a large amount of energy.
  • the secondary battery sores a large amount of energy under the charged state, and receives energy from other energy sources while being charged.
  • the received energy is stored in the battery.
  • a problem of a secondary battery such an internal short state is generated, the energy stored in the battery is discharged in a very short time period and simultaneously, and therefore a safety problem such as ignition, explosion, and so on can be generated.
  • the safety devices are usually connected to an anode terminal and a cathode terminal of a bare cell via a conduction structure called as a lead plate.
  • a conduction structure called as a lead plate.
  • the safety devices which can be connected to the bare cell, includes a protection circuit that detects an abnormal current or a voltage and blocks the flow of the current, a positive temperature coefficient (PTC) element that operates when overheating is generated due to an abnormal current, and a bimetal element.
  • PTC positive temperature coefficient
  • a secondary battery in which the bare cell and the safety devices are mutually connected, is embedded in a separate case, and thereby a complete exterior appearance is realized. Furthermore, there are many cases that a resin pack secondary battery in which a bare cell and a protection circuit are mutually connected by connecting a bare cell and a protection circuit substrate by welding, and injecting the molding resin into the space between them or the space of the periphery without using a separate case can be used as another type.
  • the molding resin portion for tightly connecting the battery elements such as the protection circuit substrate and the lead plate to the bare cell is different from a bare cell formed by a metal material such as a cap plate or a can in terms of the used materials when a pack battery is formed by connecting the bare cell and the protection circuit substrate by a resin molding, and the contact area is not so large, there is a problem that the attachment is very weak. Therefore, when an external force is applied to the secondary battery of a resin pack type, the molding resin portion of the secondary battery is removed easily from the bare cell, and this shortcoming can raise a safety issue of the secondary battery structure.
  • the exterior appearance of the completed secondary battery becomes bad, or on the contrary, when insufficient molding resin is injected between the bare cell and the protection substrate, the exterior appearance of the completed secondary battery is also bad, and the hardness of the molding resin portion is very weak, thereby the structural safety of the secondary battery is reduced remarkably.
  • the present invention provides solutions for the problems, and the object of the present invention is to provide a secondary battery in which connection between the bare cell and the protection circuit module can be established by a mechanical connection system without using molding of a molding resin.
  • the object of the present invention is also to provide a secondary battery in which the connection between the bare cell and the protection circuit module is established by a mechanical connection system, and thereby the hardness is improved for resisting an external force such as bending or distortion applied to the connection portion between the bare cell and the protection circuit module.
  • the object of the present invention is also to provide a secondary battery in which the process for connecting the bare cell and the protection circuit module can be performed easily, the connection state can be made excellent even when the connection state between the bare cell and the protection circuit module is bad, and separation and re-connection of the bare cell and the protection circuit module can be easily executed if necessary.
  • the present invention provides a secondary battery including a bare cell for storing electricity, a protection circuit substrate electrically connected to the bare cell where the protection circuit substrate includes a protection circuit for the bare cell, a substrate molding body formed in the protection circuit substrate, a support member coupled to the bare cell where the support member having a connection unit that is coupled to the substrate molding body, and a connection member for connecting the substrate molding body to the connection unit.
  • the support member has a base unit that is connected to a first surface of the bare cell, and the connection unit extends toward the substrate molding body from the base unit.
  • the support member may have a second connection unit, and the substrate molding body may be disposed between the connection unit and the second connection unit while being coupled to the support member.
  • the secondary battery may further include a second support member coupled to the bare cell where the second support member has a connection unit that is coupled to the substrate 3 molding body.
  • connection member may include a connection bolt for connecting the connection unit of the support member to the substrate molding body.
  • a screw hole may be formed on a side of the substrate molding body and a connection hole is formed on the connection unit of the support member where the connection bolt penetrates into the screw hole and the connection hole.
  • a nut may be formed inside the screw hole where the connection bolt is coupled to the nut while the substrate molding body is being connected to the connection unit.
  • the secondary battery may further include a second support member coupled to each of the bare cell and the substrate molding body.
  • the support member is arranged along a side of the first surface of the bare cell, and the second support member is arranged along another side of the first surface of the bare cell.
  • the support member and the second support members may face each other across the first surface of the bare cell.
  • the first surface of the bare cell may have a quadrilateral shape having a longer side and a shorter side, and the support member is arranged along the longer side of the first surface of the bare cell.
  • the support member can be arranged along the shorter side of the first surface of the bare cell.
  • the secondary battery may further include a second support member coupled to each of the bare cell and the substrate molding body. Both of the support member and the second support member may be arranged along one side of the first surface of the bare cell.
  • the base unit may be welded to the first surface of the bare cell.
  • the base unit can be welded to the first surface of the bare cell by a resistance welding.
  • the secondary battery may further include an adhesion layer that is disposed between the base unit and the first surface of the bare cell.
  • the base unit adheres to the first surface of the bare cell through the adhesion layer.
  • the substrate molding body can be seamlessly and integrally formed with the protection circuit substrate by injection.
  • a secondary battery including a bare cell for storing electricity, a protection circuit substrate electrically connected to the bare cell where the protection circuit substrate includes a protection circuit for the bare cell, a substrate molding body formed in the protection circuit substrate, a support member having a hook unit and a first fixing unit that is connected to a first end of the hook unit where the first fixing unit is connected to a first surface of the bare cell and the hook unit is coupled to the substrate molding-body, and a connection member for connecting the substrate molding body to the hook unit.
  • the substrate molding body may have a through hole through which the connection member is coupled.
  • the support member may have a second fixing unit that is connected to a second end of the hook unit.
  • the second fixing unit is connected to the first surface of the bare cell, and a connection hole is formed being surrounded by the hook unit and the first surface of the bare cell.
  • the connection member may include a connection pin that is disposed inside the through hole and the connection hole.
  • the width of the through hole may be formed to be equal to or smaller than the size of the cross-section of the connection pin.
  • the connection hole may have a shape of a semi-circle or polygon.
  • connection member may include a connection band that penetrates the through hole and is coupled to the hook unit.
  • the connection band wraps a portion of a surface of the substrate molding body.
  • FIG. 1 is an exploded perspective view for illustrating an embodiment of a secondary battery according to the present invention
  • FIG. 2 is a perspective view of a connection structure of a secondary battery according to an embodiment of FIG. 1 ;
  • FIG. 3 is a cross-sectional view of III-III line of FIG. 2 ;
  • FIG. 4 is a cross-sectional view illustrating another example of a connection member of a secondary battery according to an embodiment of FIG. 1 ;
  • FIG. 5 is an exploded perspective view illustrating another embodiment of a secondary battery according to the present invention.
  • FIG. 6 is a cross-sectional view illustrating a connection structure of a secondary battery according to an embodiment of FIG. 5 ;
  • FIG. 7 is an exploded perspective view illustrating another embodiment of a secondary battery according to the present invention.
  • FIG. 8 is a cross-sectional view illustrating a connection structure of a secondary battery according to an embodiment of FIG. 7 ;
  • FIG. 9 is an exploded cross-sectional view illustrating another embodiment of a secondary battery according to the present invention.
  • FIG. 10 is a cross-sectional view illustrating a connection structure of a secondary battery according to an embodiment of FIG. 9 ;
  • FIG. 11 is a lateral cross-sectional view illustrating the main portions of FIG. 10 ;
  • FIG. 12 is an exploded cross-sectional view illustrating another embodiment of a secondary battery according to the present invention.
  • FIG. 13 is a lateral cross-sectional view of a secondary battery according to an embodiment of FIG. 12 ;
  • FIG. 14 is a plane cross-sectional view of a secondary battery according to an embodiment of FIG. 12 .
  • FIG. 1 is an exploded perspective view for illustrating an embodiment of a secondary battery according to the present invention
  • FIG. 2 is a perspective view of a connection structure of a secondary battery according to an embodiment of FIG. 1
  • FIG. 3 is a cross-sectional view of III-III line of FIG. 2 .
  • the secondary battery 1 of the present invention includes a bare cell 40 , a protection circuit substrate 50 , a substrate molding body 10 integrally formed with the protection circuit substrate 50 , a support member 20 , and a connection member.
  • Charging and discharging can be performed in the bare cell 40 , and an electrode terminal 42 is connected to one surface of the bare cell 40 through an insulation gasket 44 , thereby insulation is maintained.
  • the substrate molding body 10 is integrally formed with the protection circuit substrate 50 , and thus is connected to one surface of the bare cell 40 by a mechanical connection method.
  • the substrate molding body 10 can be integrally formed with the protection circuit substrate 50 through injection molding method.
  • the support member 20 is connected to the bare cell 40 for coupling the substrate molding body 10 to one surface of the bare cell 40 , and thus includes a connection unit 24 that connects the substrate molding body 10 to one surface of the bare cell 40 .
  • the bare cell 40 has a top surface, bottom surface, and side surface.
  • the substrate molding body 10 is installed on the top surface of the bare cell 40 , and the support member is coupled to each of the bare cell 40 and the substrate molding body 10 to connect the substrate molding body 10 to the bare cell 40 .
  • the support member 20 includes a base unit 22 that is connected to the top surface of the bare cell 40 , and a connection unit 24 that extends towards the substrate molding body 10 from the base unit 22 along the direction perpendicular to the top surface of the bare cell 40 .
  • connection unit 24 is arranged at each end of the base unit 22 .
  • the pair of the connection units 24 are arranged to be parallel to each other. Two or more connection units 24 can be employed to the base unit 22 .
  • connection members 30 in this case, a connection bolt
  • connection hole 24 a a connection member 30 .
  • connection members 30 in this case, a connection bolt
  • the horizontal cross-section (cross-section parallel to the top surface of the bare cell) of the base unit 22 is formed as rectangular shape, and the pair of the connection units extends from end sides of the base unit 22 in rectangular shape. Therefore, the substrate molding body 10 is inserted into a space formed by the pair of the connection units 24 extending from the end sides of the base unit 22 and the base unit 22 in rectangular shape, and connection is established by connection members.
  • the present embodiment has a structure in which the support member 20 including the base unit 22 having a rectangular shape is connected to the bare cell 40 , and the support member 20 is fixed to the bare cell 40 in a manner that a long side of the base unit 22 extends along a thickness direction of the bare cell 40 .
  • the base unit 22 is coupled to one surface (top surface) of the bare cell 40 .
  • the element 26 refers to a welding part.
  • a pair of support members are formed on the top surface of the bare cell 40 .
  • the support members are symmetrically arranged about the electrode terminal 42 .
  • the support member 20 is an element for fixing the substrate molding body 10 , which is integrally formed with the protection circuit substrate 50 , to the bear cell 40 , it is preferable that the support member 20 is mounted on the surface on which the electrode terminal 42 of the bear cell 40 is arranged. Furthermore, the support member 20 can be formed as a pair, and can be formed on the both sides of the electrode terminal 42 on one surface of the bear cell 40 .
  • More than a pair of support members also can be coupled to the bare cell 40 . But in the present embodiment, because the support member is arranged on both sides of the electrode terminal 42 of the bare cell 40 , the support members have sufficient stability and rigidity against the substrate molding body 10 , and the installation process of the support members on the bare cell 40 can be easily executed. Therefore, it is sufficient to have a pair of the support members that are arranged on both sides of the electrode terminal 42 .
  • connection member 30 can be a connection bolt, and the connection bolt is coupled to the connection unit 24 of the support member 20 and the substrate molding body 10 .
  • the connection bolt penetrates through the connection unit 24 through a connection hole 24 a , and a lateral side of the substrate molding body 10 through screw hole 12 .
  • a screw hole 12 for the connection bolt can be formed on two opposite sides of the substrate molding body 10 .
  • a nut 14 for connection bolt can be integrally formed in the substrate molding body 10 .
  • Connection bolt is inserted into the nut 14 of the substrate molding body 10 , and thereby the connection between the connection unit 24 of the support member 20 and the substrate molding body 10 is established.
  • the base unit 22 can be coupled to one surface of the bare cell 40 via an adhesion layer 28 .
  • FIG. 5 and FIG. 6 illustrate a diagram describing another embodiment of the secondary battery according to the present invention.
  • the support member 120 includes a base unit 122 which is connected to the top surface of the bare cell 40 , and the connection unit 124 is extended toward the substrate molding body 10 from the base unit 122 along a direction perpendicular to the top surface.
  • the connection unit 124 has a connection hole 124 a in through which a connection member 30 is inserted.
  • a pair of or more than a pair of connection units 124 can be formed on the top surface of the bare cell 40 .
  • the support member can be positioned in one side of the top surface of the bare cell (for example, along an edge connected to the front side surface of the bare cell 40 ).
  • one lateral side of the substrate molding body is connected to the connection unit of the support member, and thus the substrate molding body can be installed on the top surface of the bare cell.
  • a pair of support members on both opposite sides of the top surface of the bare cell improves the stability of the installation of the substrate molding body on the top surface of the bare, it is preferable that a pair or more than a pair of support members are symmetrically formed on the top surface of the bare cell 40 about the electrode terminal 42 .
  • the substrate molding body 10 is inserted between the connection units of the support members.
  • a structure in which the support member 120 is connected to one surface of the bare cell is taken as an example, and because the support member 120 is an element for fixing a substrate molding body 10 , which is formed on the protection circuit substrate 50 , to the bare cell 40 , it is preferable that the support member 120 is formed on the surface on which the electrode terminal 42 of the bare cell 40 is provided.
  • one pair of support members 120 is arranged on one side of the electrode terminal 42 , and another pair of support members 120 is arranged on another side of the electrode terminal 42 .
  • one support member is arranged on one side of the top surface of the bare cell 40
  • another support member is arranged on another side of the top surface of the bare cell 40 .
  • the substrate molding body 10 is inserted between these two support members 120 arranged on the opposite sides of the top surface of the bare cell 40 in a thickness direction of the bare cell 40 . Therefore, each lateral side of the substrate molding body 10 is connected to one of connection units of these support members.
  • the base unit 122 of the support member 120 is formed in a rectangular shape, and the connection unit 124 extends from one longer side of the base unit 122 having a rectangular shape.
  • the longer side of the base unit 122 is formed along an edge of the top surface of the bare cell 40
  • a shorter side of the base unit 122 extends inside the top surface from the edge of the top surface, which can be viewed as a thickness direction of the bare cell 40 .
  • FIG. 7 and FIG. 8 illustrate an embodiment in which the support member is formed along different side of the top surface of the bare cell 40 from the side shown in FIGS. 5 and 6 .
  • the support member shown in FIGS. 7 and 8 is arranged along a thickness side (or edge) of the top surface of the bare cell 40
  • the support member shown in FIGS. 5 and 6 is arranged along a width side (or edge) of the top surface of the bare cell 40
  • the thickness side and the width side are relatively defined. That is, one side of the top surface is a width side, another side, which is substantially perpendicular to the width side, is a thickness side of the top surface. As illustrated in FIGS.
  • the support members 120 can be symmetrically arranged on both thickness sides of the top surface about the electrode 42 . Further, the substrate molding body 10 is inserted between the support members 120 symmetrically arranged on both thickness sides, and the substrate molding body 10 is connected to each of the support members through the side surface that is substantially parallel to the width side of the top surface. Therefore, a screw hole 12 is formed on a side of the substrate molding body 10 that is parallel to the thickness side of the bare cell 40 , and the substrate molding body 10 is connected to each of the support members through the connection member 30 .
  • the connection unit 124 has a connection hole 124 a in through which a connection member 30 is inserted.
  • the bare cell has a shape of a box or rectangular parallelopiped, and the top surface of the bare cell 40 is substantially a rectangular shape.
  • the shape of the bare cell is, however, not limited to this shape.
  • the top surface of the bare cell can be hexagon or octagon.
  • the width or thickness sides can be defined as one of sides of the geometrical shape, and the width and thickness sides do not need to be perpendicular.
  • the support members shown in FIGS. 1 through 8 can be symmetrically arranged according to the principles of the present invention. The support member can be arranged along an edge of the top surface or can be arranged slightly being retreated inside the top surface from the edge of the top surface.
  • FIGS. 9 , 10 , and 11 illustrate a diagram describing another embodiment of a secondary battery according to the present invention.
  • the support member 220 of this embodiment includes a hook unit 224 , which has a shape of an inverted U-shaped bracket, and a pair of fixing units 222 , which formed as bases connected to the bottom ends of the inverted U-shaped bracket.
  • the support member 220 is formed on a top surface of the bare cell 40 with the fixing units 222 connected to the top surface. Therefore a space is formed between the hook unit 224 and the top surface of the bare cell 40 . That is to say, the space is enclosed by the hook unit 224 and the top surface as shown in FIG. 9 .
  • the hook unit 224 can have a shape that is slightly curved or bent plate, and fixing units 222 are formed at both ends of the bent plate. Therefore, if the fixing units 222 are connected on the top surface of the bare cell 40 , the hook unit 224 having a shape of a bent plate form a space, which is referred to as a connection hole 226 .
  • the cross-sectional shape of the connection hole 226 can be a semi-circle or trapezoid, depending on the shape of the hook unit 224 .
  • a connection member for connecting the support member 220 and the lateral side of the substrate molding body 210 can be a connection pin 230 . That is, the connection pin 230 having a cross-section shape corresponding to the horizontal cross-section shape of the hook unit 224 of the support member 220 is provided, and the connection pin 230 is inserted by penetrating through one lateral side of the substrate molding body 210 , the connection hole 226 formed inside the hook unit 224 of the support member 220 , and the other lateral side of the substrate molding body 210 , sequentially. At this time, both ends of the connection pin 230 are supported on one lateral side of the substrate molding body 210 , and one surface thereof is supported against the inner side of the connection hole 226 of the support member 220 .
  • connection pin 230 supports two opposite lateral sides of the substrate molding body 210 via both ends thereof while the connection pin 230 is inserted the support member 20 which is connected to one surface of the bare cell 40 , and thus the substrate molding body 210 is connected to one surface of the bare cell 40 without being separated from the bare cell 40 .
  • a through hole 212 is formed on the two opposite lateral sides of the substrate molding body 210 for insertion and support of the connection pin 230 , and at this time, the cross-section shape of the through hole 212 corresponds to the vertical cross-section shape of the connection pin 230 , and the distance between the surface of the substrate molding body 210 contacting to one surface of the bare cell 40 and the through hole 212 corresponds to the height of the fixing unit 222 of the support member 220 when designating one end of the substrate molding body 210 contacting to one surface of the bare cell 40 as a reference.
  • connection pin 230 is formed as a structure having the sharp ends, because it is not easy to insert the pin into the lateral side of the substrate molding body 210 , a through hole 212 of the shape corresponding to the shape of the insertion hole 226 of the support member 220 is formed on two opposing lateral sides of the substrate molding body 210 , thereby a process for supporting the substrate molding body 210 against one surface of the bare cell 40 can be easily executed by inserting the connection pin 230 into the substrate molding body 210 and the support member 220 .
  • connection pin 230 can be easily inserted via the through hole 212 of the substrate molding body 210 , even if it is formed as being soft in terms of hardness, it can exhibit the support function against the substrate molding body 210 sufficiently, and thus the connection pin 230 can be manufactured by injection molding like the substrate molding body 210 . That is, the materials necessary of forming the connection pin 230 can be identical to those employed for forming the substrate molding body 210 , and therefore, facilitation of abrasion of the substrate molding body 210 , and reduction of support force of the connection pin 230 against the substrate molding body 210 which can be generated due to the connection pin 230 when forming the connection pin by using very hard materials as compared with the substrate molding body 210 can be prevented.
  • connection pin 230 is closely attached to the inner side of the through hole 212 , and is inserted into the through hole 212 and the insertion hole 226 of the support member 220 , and thereby the supporting function against the substrate molding body 210 can be performed excellently.
  • the support member 220 and the connection pin 230 functioning as a connection member are applied to the bare cell 40 in polygonal shape. Therefore, the support member 220 is formed as a pair on both ends of one surface on which the electrode terminal 42 of the bare cell 40 in polygonal shape is provided with centering around the electrode terminal 42 , and the substrate molding body 210 is connected to one surface of the bare cell 40 while the substrate molding body 210 is supporting both ends of one surface on which the electrode terminal 42 of the bare cell 40 in polygonal shape is provided with centering around the electrode terminal 42 by using a pair of the connection pins 230 and a pair of the support member 220 .
  • the support member 220 and the connection pin 230 are formed as a pair arranged on both sides with centering around the electrode terminal 42 , but it is not limited to this structure, and it is natural that they can be formed at many positions if necessary.
  • FIGS. 12 through 14 illustrate a diagram describing another embodiment of a secondary battery according to the present invention.
  • the support member 220 has a structure which is identical to those of the support members of the embodiments shown in FIG. 9 and FIG. 10 , and a connection member for connecting the substrate molding body 210 to one surface of the bare cell 40 via such a support member 220 comprises a connection band 330 . That is, the connection band 330 connects the substrate molding body 210 to the support member 220 tightly via the through hole 212 formed on both opposing sides of the substrate molding body 210 , and the connection hole 226 formed inside the hook unit 224 of the support member 220 .
  • the a structure can be realized in which the substrate molding body 210 is connected and fixed to the bare cell 40 via the connection band 230 and the support member 220 .
  • the bare cell and the protection circuit substrate are connected as a mechanical connection structure comprising a substrate molding body, a support member and a connection mean, a tightly connected structure can be maintained as compared with the conventional structure for connecting the bare cell and the protection circuit substrate by a molding resin. Therefore, intensity of resistance of the connection portion where the bare cell and the protection circuit substrate are connected mutually is improved against the external force such as distortion or bending applied to the connection portion.
  • injection process of molding resin could not be performed smoothly during a conventional molding process for the bare cell and the protection circuit substrate, and the phenomenon took place that the connection state between the bare cell and the protection circuit substrate can become very bad due to such an insufficient molding resin, but in the present invention, this problem is excluded from the beginning.
  • the problem can be excluded initially that excessive injection of the molding resin is performed during a molding process for the bare cell and the protection circuit substrate, and thus the connection portion between the bare cell and the protection circuit substrate becomes bad.
  • connection state between the bare cell and the protection circuit substrate is not so excellent, it is possible to connect them once again after separating them, and the process for connecting the bare cell and the protection circuit substrate once again can be easily executed after separating the bare cell and the protection circuit substrate if necessary.
  • the secondary battery according to the present invention since the bare cell and the protection circuit substrate are connected by a mechanical connection structure, and thus the process for connecting the bare cell and the protection circuit substrate can be executed many times at the same time without any restrictions if necessary, a secondary battery can be realized in which the connection portion between the bare cell and the protection circuit substrate is always maintained as a excellent state.
  • connection force between the bare cell and the protection circuit substrate does not always depend on the molding portion having a relatively weak hardness, and they are connected through the connection between the frame molded by injection, and the support member having a predetermined hardness, the connection force is improved, and hardness for resisting the external force such as bending or distortion applied to the connection portion between the bare cell and the protection circuit module is improved.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Battery Mounting, Suspending (AREA)
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US11/979,070 2006-10-30 2007-10-30 Secondary battery Expired - Fee Related US8637172B2 (en)

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JP2010257605A (ja) * 2009-04-21 2010-11-11 Hitachi Maxell Ltd 電池パック
KR101066001B1 (ko) * 2009-09-01 2011-09-19 삼성에스디아이 주식회사 이차전지
US8790823B2 (en) 2011-02-08 2014-07-29 Samsung Sdi Co., Ltd. Battery unit and battery pack having less resistance and improved contacts
JP6171314B2 (ja) * 2012-11-19 2017-08-02 株式会社Ｇｓユアサ 蓄電装置
WO2020095585A1 (ja) * 2018-11-08 2020-05-14 株式会社村田製作所 電池パック、電池パックの製造方法、電子機器、電動工具及び電動車両

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EP1919022A1 (de) 2008-05-07
US20080102357A1 (en) 2008-05-01
KR100833744B1 (ko) 2008-05-29
JP5064957B2 (ja) 2012-10-31
KR20080038700A (ko) 2008-05-07
EP1919022B1 (de) 2014-05-07
CN101174680A (zh) 2008-05-07

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